x=20
y=10
x=x+y
print(x)
x+=y
print(x)
x-=y
print(x)
x*=y
print(x) #300
x/=y
print(x) #30.0
z=3
y//=z  #相当于 y=y//z
print(y)
y**z   #相当于 y=y**z
print(y) #9
a=b=c=100  #相当于a=100 b=100 c=100
print(a,b,c)
e,f=10,20    #e=10 f=20
print(e,f)
